| Investigation of thermal energy potential, pyroelectric, and electrocaloric performance of Ba0.7Ca0.3TiO3 ceramic |
| A. Ray1,2, B. Nayak2,3, P. Elorika2,3, R. Barman1, A. Sharmistha2,3, T. Badapanda1, S. Anwar2,3 |
1Department of Physics , C.V. Raman Global University , Bhubaneswar 752054 , India
2CSIR-Institute of Minerals and Materials Technology , Bhubaneswar 751013 , India
3Academy of Scientific and Innovative Research (AcSIR) , Ghaziabad , Uttar Pradesh 201002 , India |
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Received: December 5, 2022; Revised: April 1, 2023 Accepted: April 5, 2023. Published online: April 24, 2023. |
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| ABSTRACT |
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In the current work, the structural, dielectric, and electrocaloric performance of Ba0.7Ca0.3TiO3 ceramic synthesized by solidstate reaction route is presented. The structural analysis was examined by X-ray diff raction and Rietveld refinement, which confi rms the existence of a combined phase of tetragonal structure with P4mm symmetry and orthorhombic structure with Amm2 symmetry. The scanning electron micrograph shows well-defi ned and pore-free grains. The temperature-dependent dielectric performance shows diff use phase transition behavior. The temperature-dependent ferroelectric hysteresis behavior was examined under the application of various amplitudes of an applied electric fi eld. The energy storage density, energy loss density, and energy storage effi ciency of the composition at diff erent temperature were calculated using the standard formula. The thermal energy potential has been calculated by employing the Olsen cycle. Also, pyroelectric fi gures of merit (FOMs) for voltage responsivity ( Fv ), current responsivity ( Fi ), energy harvesting ( Fe ), new energy harvesting ( F∗e ), and detective ( Fd ) were calculated. Adiabatic temperature change, isothermal entropy change, and electrocaloric strength are evaluated using an indirect technique based on the thermodynamic Maxwell's relation. |
| Key words:
Lead-free ceramic · Dielectric · Ferroelectric · Olsen cycle · Electrocaloric eff ect · Pyroelectric coeffi cient |
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